Type of Oil to Use in Husqvarna Riding Mowers

Husqvarna’s riding mower holds 20 ounces of motor oil to lubricate its engine. Husqvarna recommends oil that has an API classification of SG-SL. API stands for the American Petroleum Institute that provides standard oil ratings. The recommended weight of oil depends on the temperature in which you will be mowing.

Importance of Correct Oil

Oil both lubricates and helps cool the engines of Husqvarna riding mowers. It lubricates by maintaining a thin film that separates the engine’s moving parts. As the oil deteriorates with use, it loses its ability to separate the parts and metal pistons move directly against metal cylinders. It cools by transferring the heat generated by the moving pistons to the engine block. For your mower to operate with less friction and at lower temperatures, it is important to follow the manufacturer’s recommendations.

Oil Weight and Temperature

Use SAE 30 motor oil when you run your mower at temperatures above freezing temperatures. If you typically run your mower at more than 40 degrees Fahrenheit, use SAE 30. Use SAE 5W-30 at temperatures below freezing. Although using SAE-30 oil will make it easier to start your mower in cold weather, it will use more oil if you run it at temperatures above freezing.

Checking the Oil

Check the level of motor oil before each mowing and check it again after eight hours of use. Use the gauge on the oil dipstick to check the oil level. Tighten the dipstick securely into the tube before you remove the dipstick to check the level. The oil should be at the “full” line on the dipstick. If it needs more oil, pour it slowly though the dipstick tube and take care not to overfill. When you’re finished, tighten the cap securely on the dipstick tube.

Changing the Oil

Change the oil after you run your mower 25 hours and before you store it in the off-season. Change it at least once a year if you do not run it 25 hours in one cutting season. Before you begin, make sure your mower is level. It’s easier to drain the oil if the engine is warm. Remove the cap and insert a mechanical or electrical siphon pump to remove the oil. When the reservoir is empty, refill it to the "full" line on the dipstick.